package com.atguigu.springcloud.controller;

import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

/**
 * @ClassName OrderController
 * @Description 客户端 订单模块 拥有Controller层即可 调用服务
 * @Author 周轩霆
 * @Date 2022/9/27 14:04
 **/
@Slf4j
@RestController
public class OrderController {
    // public static final String PAYMENT_URL = "http://localhost:8002";
    //多个服务提供者 不要写死
    public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";

    @Resource
    //RestTemplate提供了多种便捷访问远程Http服务的方法，是一种简单便捷的访问restful服务模板类，是Spring提供的用于访问Rest服务的客户端模板工具集
    private RestTemplate restTemplate;
    //引入自己写的相关方法
    @Resource
    private LoadBalancer balancer;

    @Resource
    private DiscoveryClient discoveryClient;

    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment) {

        //订单模块调用支付模块
        /**
         * 使用restTemplate访问restful接口非常的简单粗暴无脑。
         * (url, requestMap, ResponseBean.class)这三个参数分别代表。
         * REST请求地址、请求参数、HTTP响应转换被转换成的对象类型。
         *
         * */
        return restTemplate.postForObject(PAYMENT_URL + "/payment/create", payment, CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id") Long id) {

        return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
    }

    @GetMapping("/consumer/payment/getEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable("id") Long id) {
        //restTemplate的getForEntity方法测试
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);
        log.info("状态码：" + entity.getStatusCode() + "相应头" + entity.getHeaders());
        if (entity.getStatusCode().is2xxSuccessful()) {
            return entity.getBody();
        } else {
            return new CommonResult<>(444, "操作失败");
        }
    }

    @GetMapping("/consumer/payment/lb")
    public String getPaymentLB() {
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if (instances==null||instances.size()<=0) {
            return null;
        }//用自己的算法
        ServiceInstance serviceInstance= balancer.instances(instances);
        //知道调用了哪个服务之后，获取其uri
        URI uri = serviceInstance.getUri();
        return restTemplate.getForObject(uri+"/payment/lb",String.class);

    }
}
